A series of hyperbranched polymer surfactants(HBP-C8,HBP-C12 and HBP-C16)were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers(HBP)and fatty acyl chloride.The structure of obtained hyperb...A series of hyperbranched polymer surfactants(HBP-C8,HBP-C12 and HBP-C16)were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers(HBP)and fatty acyl chloride.The structure of obtained hyperbranched polymer surfactant was characterized by FTIR,NMR and GPC.The results showed that the products have amphiphilic structure.The thermal property of the hyperbranched polymer surfactant investigated by DSC and TGA was strongly influenced by the length of end alkyl chain.Surface activity of hyperbranched polymer surfactant was analyzed by surface tension method and UV spectrophotometry,respectively.The results showed that hyperbranched polymer surfactant took on better surface activity,which can effectively reduce the surface tension of the water.The hyperbranched polymer surfactant has a lower critical micelle concentration(CMC)and displays single molecular micellar properties,which can package small hydrophilic molecules in relatively low concentration.展开更多
The effect of salinity on sludge alkaline fermentation at low temperature（20°C） was investigated, and a kinetic analysis was performed. Different doses of sodium chloride（Na Cl, 0–25 g/L） were added into the...The effect of salinity on sludge alkaline fermentation at low temperature（20°C） was investigated, and a kinetic analysis was performed. Different doses of sodium chloride（Na Cl, 0–25 g/L） were added into the fermentation system. The batch-mode results showed that the soluble chemical oxygen demand（SCOD） increased with salinity. The hydrolysate（soluble protein, polysaccharide） and the acidification products（short chain fatty acids（SCFAs）, NH＋4–N, and PO_4^（3-）–P） increased with salinity initially, but slightly declined respectively at higher level salinity（20 g/L or 20–25 g/L）. However, the hydrolytic acidification performance increased in the presence of salt compared to that without salt.Furthermore, the results of Haldane inhibition kinetics analysis showed that the salt enhanced the hydrolysis rate of particulate organic matter from sludge particulate and the specific utilization of hydrolysate, and decreased the specific utilization of SCFAs. Pearson correlation coefficient analysis indicated that the importance of polysaccharide on the accumulation of SCFAs was reduced with salt addition, but the importance of protein and NH＋4–N on SCFA accumulation was increased.展开更多
文摘A series of hyperbranched polymer surfactants(HBP-C8,HBP-C12 and HBP-C16)were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers(HBP)and fatty acyl chloride.The structure of obtained hyperbranched polymer surfactant was characterized by FTIR,NMR and GPC.The results showed that the products have amphiphilic structure.The thermal property of the hyperbranched polymer surfactant investigated by DSC and TGA was strongly influenced by the length of end alkyl chain.Surface activity of hyperbranched polymer surfactant was analyzed by surface tension method and UV spectrophotometry,respectively.The results showed that hyperbranched polymer surfactant took on better surface activity,which can effectively reduce the surface tension of the water.The hyperbranched polymer surfactant has a lower critical micelle concentration(CMC)and displays single molecular micellar properties,which can package small hydrophilic molecules in relatively low concentration.
基金supported by the National Natural Science Foundation of China (No. 51178007)
文摘The effect of salinity on sludge alkaline fermentation at low temperature（20°C） was investigated, and a kinetic analysis was performed. Different doses of sodium chloride（Na Cl, 0–25 g/L） were added into the fermentation system. The batch-mode results showed that the soluble chemical oxygen demand（SCOD） increased with salinity. The hydrolysate（soluble protein, polysaccharide） and the acidification products（short chain fatty acids（SCFAs）, NH＋4–N, and PO_4^（3-）–P） increased with salinity initially, but slightly declined respectively at higher level salinity（20 g/L or 20–25 g/L）. However, the hydrolytic acidification performance increased in the presence of salt compared to that without salt.Furthermore, the results of Haldane inhibition kinetics analysis showed that the salt enhanced the hydrolysis rate of particulate organic matter from sludge particulate and the specific utilization of hydrolysate, and decreased the specific utilization of SCFAs. Pearson correlation coefficient analysis indicated that the importance of polysaccharide on the accumulation of SCFAs was reduced with salt addition, but the importance of protein and NH＋4–N on SCFA accumulation was increased.
